lingley



(ModeL) J. W. LINGLEY.

' SEWING MACHINE.

Patented Aug. 1%, 1887.

TATES NITE are r anion.

JOHN IV. LINGLEY, OFQUINOY, MASSACHUSETTS, ASSIGNOR TO DAVID WVHITTEMORE, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 368,538, dated August 16, 1887. Application filed December 11, 1886. Serial No. 221,280. lModel.)

To all whom it may concern.-

Be it known that I, J onn W. LINaLnY, a citizen of Canada, and a resident of Quincy, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Sewing-lilachines, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to improvements in the feed-bar and cast-off bar for sewing-ma chines, and it is carried out as follows, reference being had to the accompanying drawings, where Figure 1 represents a front elevation of the feed-bar and its connections to the drivingshaft. Fig. 2 represents a sectional view on the line A I), shown in Fig. 1. Fig. 3 represents a rear view of the feed-bar; and Fig. 4 represents a detail perspective view of the cast-off bar.

Similarletters refer to similar parts, wherever they occur, on the different parts of the drawings.

a represents the worksupporting post on a sewing-machine, as usual, and a is the worksupporting plate on top of it.

b is the rotary driving-shaft, as usual, such shaft being supported in a horizontal bearing in the lower part of the post a in the ordinary way.

0 is the feed-bar, having on its rear side a vertical groove, 0, in which is up and down adjustable the block d, to which is pivoted the fulcruni pin d, passing through a vertical slot, as usual, in the post a, and secured to the latter by means of the nut cl. (Shown in Figs. 2 and 3.)

By adjusting the position of the block (I in the groove 0 and the bolt or fulcrum-pin d in the slot in post a the desired amount of feed of the needle is obtained, as is common in sewingmachines of this kind.

To the driving-shaft b is secured the cam or eccentric b, located in a vertical slot, 0'', in the rear portion of the bar 0, by which arrange ment a rocking motion is imparted to the said feed-bar from the rotary drivingshaftb. For the purpose of impart-ing a positive rocking motion to said feed-bar, and also to enable the wear on the interior vertical sides of the slot 0 (against which the cam b acts) to be taken up from time to time, I secure permanently to one of the vertical sides of said slot 0 a hardened steel plate, 0, preferably inserted in a dovetailed recess in the feed-bar, as shown in Fig. 3. In a groove or recess on the opposite side of said vertical slot 0, I locate an adjustable hardenedstcel plate, 6, which is made adjustable in a horizontal direction by means of pressure screws 6 e, screwed through the side of the feed-bar 0, their inner ends bearing against the outside of the steel plate 0', and their outer ends preferably provided with set-nuts 0 e as shown in Fig. 3.

To the front end of the shaft 12 is secured the concentric circular disk I), on which is arranged in a groove the adjustable crank-bar b as usual, which bar is secured to the disk I) by means of the set-screw b, that passes through a slot-hole in the crank-bar 6 as shown in Fig. 1. The bar b is provided with the usual crank pin or screw, [2 to which the lower end of the needlebar connection or link 9 is pivoted, as shown in Figs. 1 and 2.

The slot 0 in the lower front end of the feed-bar c is long enough in a horizontal direction to permit said feed-bar to rock on the fulcrumpin d without the ends of such slot coming in contact with the disk D. The ver-, tical opening or extent of said slot 0 is equal to the diameter of the disk I), by which the feed-bar c is prevented from moving up or down, and to prevent such parts of the slotted feed-bar that are in contact with the disk b from wearing out, as well as for the purpose of taking up the slack or wear, I insert at top of slot 0" a hardened-steel plate, f, preferably in a dovetailed recess, as shown in Figs. 1, 2, and 3, and in a slot or recess in the lower part of the feed-bar c, I locate another hardened-steel plate, f, which is adjustable toward the disk I) by means of screws f f, screwed through the feed-bar 0, their upper ends resting against the under side of the plate f, as shown in Figs. 1 and 2.

f f are set-nuts on the projecting ends of the screwsff, for the purpose of securing said screws firmlyin positions after adjustment.

h is the needle-bar, as usual,vertically inovable in guides on the feed-bar, said needle-bar being hinged, by means of the pin or screw 71., to the upper end of the link g, as shown in Figs. 1 and 2.

The link 9 is provided in its upper end with a side projection, (shown in Fig. 1,) which projection serves to impart a vertical intermittent reciprocating motion to the cast-off bar 70, as will be hereinafter more fully described. The said cast-off bar 70 is vertically movable in suitable guides on the feed-bar c, and it is prevented from dropping out of such guides by means of the cap plate or cover I,

secured to the cast-off-bar guides or other stationary parts of the feed-bar c. The said cap or coverl is provided with slotted perforations Z" l, to allow the projections on the cast-off bar to move freely therein. a

The cast-off bar 70 has on its rear side alongitudinal groove, 7c, (shown in Figs. 2 and 4,) in which are arranged the vertically-adjustable nuts m m, into which the inner ends of the studs or projections n n are screwed after passing through the slot-holes 7t 7c in the front of the cast-oft bar 70, asshown in Figs. 1, 2, and 4.

h is the needle secured, as usual, to the up- I per end of the needle'bar h, and 70 is the castoff secured in a suitable manner to the upper end of the cast-off bar 7c.

0 0 are friction-blocks passing through perforations made in the side of the feed-bar 0, their inner ends being pressed against the side of the cast-off bar It by means of the spring 0, secured in an adjustable manner to the feedbar 0 by means of the set-screw 0', or equivalent friction device,to hold the cast-off bar in the position within its guides in which it is left by the action of the link-projection g,and until it is again reciprocated by the latter.

As the link 9 is moved up and down by the action of the crank-pin b, it comes in contact with the studs n n on the cast-off bar k, and thus imparts an intermittent reciprocating motion to the latter.

By means'of the nuts in m, groove 70', and slots k 70 in the cast-off bar the studs n a may be adjusted up and down on the cast-oft bar and firmly secured to the latter in positions according the desired throw of the cast-off bar relative to the motion of the needlebar.

Having thus fully described the nature, construction, and operation of my invention, I wish to secure by Letters Patent, and claim- 1. In a sewing-machine, the rotary shaft 7), having crank-pin b the needle-bar h, and link 9, pivoted to said crank-pin and needle-bar and having the projection g, in combination with the cast-off bar is, provided with the studs 12 a, as and for the purpose set forth.

2. The improved cast-off bar 70, having the longitudinal groove 7c,the nuts m m, adjustable within said groove, and the studs n a, secured to said nuts m m, as and for the purpose set forth.

3. The feed-bar 0, having aperforation in its lower end for the reception of the cam bf and disk I), in combination with said cam 12 and disk I), and with the stationary plates 6 f and adjustable plates 6 f and their regulating screws and nuts 6 e ff, as and for the purpose set forth.

In testimony whereof Ihave signed my name to this specification,in the presence of two subscribing witnesses, on this 6th day of December, A. D. 1886.

JOHN W. LINGLEY.

WVitnesses:

ALBAN ANDREN, W. L. WHITTEMORE. 

